Overview

• RIVM took its site offline around 11:15 local time as a precaution after detecting unauthorized changes.
• Attackers exploited a vulnerability in an online form to insert unrelated content, including an English diabetes text and a dog YouTube video.
• The institute says it patched the form weakness and removed the inserted material before restoring normal operation.
• Officials state the incident did not involve ransomware or a targeted intrusion, and there was no contact with the perpetrators.
• The website returned around 15:30 after the issue was flagged by a Reddit user, as reported by NOS and RTV Utrecht.